Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853001 | Porous inorganic siliceous-containing gas enriching material and process of manufacture and use | — | 1989-08-01 |
| 4842620 | Process of gas enrichment with porous siliceous-containing material | Walter J. Robertson, William P. Marshall, Herbert W. Barch, Balbhadra Daas, Michael A. Smoot +1 more | 1989-06-27 |